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1/*
2 * Copyright (c) 2007 Intel Corporation
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Authers: Jesse Barnes <jesse.barnes@intel.com>
18 */
19
20#include <linux/i2c.h>
21#include <linux/fb.h>
22#include <drm/drmP.h>
23#include "psb_intel_drv.h"
24
25/**
26 * psb_intel_ddc_probe
27 *
28 */
29bool psb_intel_ddc_probe(struct i2c_adapter *adapter)
30{
31	u8 out_buf[] = { 0x0, 0x0 };
32	u8 buf[2];
33	int ret;
34	struct i2c_msg msgs[] = {
35		{
36		 .addr = 0x50,
37		 .flags = 0,
38		 .len = 1,
39		 .buf = out_buf,
40		 },
41		{
42		 .addr = 0x50,
43		 .flags = I2C_M_RD,
44		 .len = 1,
45		 .buf = buf,
46		 }
47	};
48
49	ret = i2c_transfer(adapter, msgs, 2);
50	if (ret == 2)
51		return true;
52
53	return false;
54}
55
56/**
57 * psb_intel_ddc_get_modes - get modelist from monitor
58 * @connector: DRM connector device to use
59 *
60 * Fetch the EDID information from @connector using the DDC bus.
61 */
62int psb_intel_ddc_get_modes(struct drm_connector *connector,
63			    struct i2c_adapter *adapter)
64{
65	struct edid *edid;
66	int ret = 0;
67
68	edid = drm_get_edid(connector, adapter);
69	if (edid) {
70		drm_mode_connector_update_edid_property(connector, edid);
71		ret = drm_add_edid_modes(connector, edid);
72		kfree(edid);
73	}
74	return ret;
75}
76